Senator Stephen Conroy (centre) and other Select Committee members at one of many hearings on the NBN in 2013. Photo: Alex Ellinghausen

A move by Liberal Senator Cory Bernardi to introduce two motions into the Senate on Wednesday has been delayed until Thursday.

The first motion would abolish the current Senate Select Committee on the NBN and the second would establish a new Joint Select Committee to monitor the NBN rollout and the company's financial and operational performance. The motions are expected to pass with the support of the Palmer United Party senators.

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The current committee, established after the last election, has three Coalition senators, three Labor senators and one Greens senator. The new committee would have five Coalition members, three Labor members and one minor party member.

"Malcolm Turnbull is trying to kill scrutiny of the NBN. Regardless of what you think about the NBN, this is the biggest infrastructure project in Australia."

The existing committee's hearings have been notable for fiery clashes between former communications minister Stephen Conroy and NBN Co executives.

The committee has produced one interim report and was understood to be working on a second to be tabled in the next couple of months.

It was tasked with providing its final report on June 10, before changes in the Senate's make-up took effect in July. The inquiry was subsequently extended with a final report due on the last sitting day of the current Parliament.